Set up by Steve Sisolak, chairman of the Clark County (Nevada) Commission, the campaign raised more than $900,000 its first six hours, and continues to accept donations toward its $2 million goal. Funds raised will be used to provide relief and financial support to the victims and families of the tragedy.

The National Compassion Fund, which focuses on helping people affected by a mass crime, also has set up a dedicated fund that will be distributed directly to victims of the Las Vegas shooting.

A gunman, identified by authorities as 64-year-old Stephen Paddock, opened fire on an estimated 22,000 concertgoers at a music festival in the city. Police said at least 10 rifles were in Paddock's possession when he was found dead in a 32nd-floor room of the Mandalay Bay Resort and Casino.